.9" Polished Ethiopian Chocolate Opal Nodule - Yita Ridge

Ethiopian chocolate opal is a nodular form of opal discovered in the 1990s. They form within a roughly 10-foot-thick layer of volcanic ash on the northern side of Yita Ridge in the Amhara Region of Ethiopia. These nodules are known for their chocolate-like coloration and exceptional color play, though only a small percentage of these nodules actual display opalescence. Red and orange are the most common colors seen: blue is quite rare. Specimens with a complete color spectrum are understandably considered to be the highest quality of Ethiopian chocolate opal.